On-glass UHF: loads of inquiries
for on-glass for 4WD and modern vehicles without gutters, so we are well
stocked

ANTENNA
GAIN

With
low antenna gain the radiation pattern is essentially a donut shape of
energy around the antenna. Shown here is a vertical antenna and cross
section of the donut at 3dB gain. As more sections are added to the antenna
the donut becomes flattened. The same amount of transmitter power is being
fed into the antenna and the result is that the energy is radiated further
(6dB gain antenna). More antenna sections increase the gain more and flatten
the radiation pattern into a disk (9dB gain antenna).

What
is dB? A decibel (dB) is an engineering convenience for expressing power
ratios. It is 10 log P1/P2. 10 log 2/1 = 3 dB. In other words every time you
have an equivalent of double the power you add 3 dB. So your 3dB antenna is
the equivalent of having a transmitter with twice the power, and 6 dB is the
equivalent of 4 times the power. 9dB is the equivalent of 8 times the
transmitter power. 12dB is the equivalent of 16 times the transmitter power
(6dB + 6dB is the same as 4 x 4 = 16 times !)

So
how much gain is good ? It depends what you are trying to do. For base
station antennas high gain is good. For vehicles a gain of around 4.5dB is
usually the best.

It
has to be dB relative to something, a dipole (dBd) or isotropic (dBi).

VEHICLE
RADIATION PATTERNS

Too
much antenna gain results in the energy being directed towards the sky or
down into the ground, when the vehicle is in hilly terrain. A lower gain
antenna will capture the antenna of the other vehicle in hilly terrain.

Some
of our customers buy two antennas and a changeover switch. One long range
antenna and one short range for sand dunes.

88S/477

$26.40

88S/477

Designed
for the Australian UHF frequency band.

Stubby
antenna for roof mount, magnetic bases etc.

Ground
plane independent

Frequency:

477
MHz UHF

Gain:

3dB

Impedance

50 ohms

Polarization

Vertical

Connector

PL259 in base
of antenna

Weight

118
g

Length

385
mm

SNAZZY

NL-RS/477

$26.40

NL-R2/477

Designed
for the Australian UHF frequency band.

Stubby
antenna for roof mount, magnetic bases etc.

Flexible
type.

Ground
plane independent.

Frequency:

477
MHz UHF

Gain:

3dB

Impedance

50 ohms

Polarization

Vertical

Connector

PL259 in base
of antenna

Weight

109
g

Length

385
mm

FLEXI

NA-771/477
for handhelds

$20.40

NA771/477

Designed
for the Australian UHF frequency band.

Gain
antenna for handheld radios eg Vertex VX-426

Flexible
type.

Frequency:

477
MHz UHF

Gain:

2.15dB

Impedance

50 ohms

Polarization

Vertical

Connector

SMA
male in base of antenna

Weight

53
g

Length

390
mm

NL-350/477

$23.30

NL-350/477

Designed
for the Australian UHF frequency band.

Stubby
antenna for roof mount 220mm long

Frequency:

477
MHz UHF

Gain:

unity

Impedance

50 ohms

Polarization

Vertical

Connector

PL259 in base
of antenna

Weight

70
g

Length

220
mm

Commercial
grade quality. Ideal for country use.

Expect
to pay twice this for similar items. Add the antenna below for city.

$59.95
value item. The best.

Complete
kit with 5 metres of the best low loss double shield cable.

Loss
is approx 1dB only at 477 MHz.PL259 plug and SO239 mount.

$79.90
The best.

TQC-400FI-477

Designed
for the Australian UHF frequency bands for Radio
Specialists.

Comes complete with a spring. These antennas have
a slender upper section and thicker lower section which makes them very
sturdy and at the same time allows the antenna to flex considerably and
hence are suitable for 4WD off road use. Inside the spring is braid hence
the flexing of the spring will not detune the antenna. Bull bar mount or
roof mount.

This
antenna will suit most applications requiring medium gain as described
above.

Frequency:

UHF

Bandwidth:

16 MHz

Gain:

5.5dBi

VSWR

< 1.5:1

Impedance

50 ohms

Polarization

Vertical

Maximum power

100 Watts

Connector

PL259 in base
of antenna

Length

813mm at 477
MHz

AE4705
477 MHz 4.5dB bull bar style antenna

1200mm
long. Our top seller. $ in-store

AE4705

AE4706 Same style as above but 2100 mm
long. $ in-store.

AE4706

The big ones.
Always in stock in the shop. 6dB gain and 2.1m long. Buy this one and
also the smaller whip to go with it, the AW4702 4dB 1m long for around
town.

Window
clip and UHF 477 MHz antenna

Nifty
idea for travellers who don't want to use magnetic bases

Good
SWR tested with this combination.

Use
it with your handheld UHF or your in-car UHF.

Complete
kit with 2.75m (9 ft) of cable. $47.95

The
antenna can be removed and will fit on radios that have an SMA socket eg
Vertex VX-426

WCLIP477

UHF
CB frequency 477 MHz.

Ground plane independent.

Great
idea for travellers, hire cars etc.

Pop
it in your suitcase.

Frequency:

UHF

Gain:

unity
- half wave radiator

VSWR

< 1.5:1

Impedance

50 ohms

Polarization

Vertical

Maximum power

10 Watts

Connector

SMA
in base
of antenna

Length

400mm
approx

Top
grade, quality item 950mm high

Stock
item. The spring is included at this price!

$119.95
value item.

CL474COMBI

Designed
for the Australian UHF frequency bands this is a quality Australian made
antenna for those who like the white sticks on the bull bar. Very
competitive price.

Centre
frequency of 477 MHz and ground independent. Suitable for
4WD off road use. Inside the spring is braid hence the flexing of the
spring will not detune the antenna.

Frequency:

UHF 477
MHz

Gain

4.5dBd
(6.6dBi)

VSWR

< 1.5:1

Impedance

50 ohms

Polarization

Vertical

Maximum power

50 Watts

Connector

PL259 in base
of antenna

Length

950mm

Weight

320g

Top
grade, quality item 1130mm high

Stock
item. The spring is included at this price!

$139.95
value item.

CP474S

Designed
for the Australian UHF frequency bands this is a quality Australian made
antenna for those who like the white sticks on the bull bar. Very
competitive price.

Centre
frequency of 477 MHz and ground independent. Suitable for
4WD off road use. Inside the spring is braid hence the flexing of the
spring will not detune the antenna.

Frequency:

UHF 477 MHz

Gain

4.5dBd
(6.6dBi)

VSWR

< 1.5:1

Impedance

50 ohms

Polarization

Vertical

Maximum power

200 Watts

Connector

PL259 in base
of antenna

Length

1130mm

Weight

490g

Top
grade, quality item 1630mm

Stock
item. The spring is included at this price!

$149.95
value item.

CP476S

Designed
for the Australian UHF frequency bands this is a quality Australian made
antenna for those who like the white sticks on the bull bar. Very
competitive price.

Centre
frequency of 477 MHz and ground independent. Suitable for
4WD off road use. Inside the spring is braid hence the flexing of the
spring will not detune the antenna. This is a high gain antenna and
you will get a good signa out.